Materials Science Forum, Vol.408-4, 499-504, 2002
Characterization of cold drawn gold bonding wire with EBSD
Cold drawn gold bonding wires have been investigated with Electron Back Scatter Diffraction (EBSD). The textures of drawn gold wires contain major <111>, minor <100> and small fractions of complex fiber components. The <100> oriented regions are located in the center and surface of the wire, and the complex fiber component regions are located near the surface. The <111> oriented regions occur throughout the wire and have large Taylor factors and would be expected to have higher stored energy as a result of plastic deformation compared to the <100> regions. Large misorientations (angles > 40degrees) are located between the <111> and <100> regions, which means that the boundaries between them are likely to have high mobility. Boundaries within the <111> regions are predominantly <111> tilt grain boundaries with large misorientations, similarly, the <100> regions have <100> tilt grain boundaries with smaller misorientations. It appears that the stored energy as indicated by geometrically necessary dislocation content in the subgrain structure is similar in all orientations despite the large differences in Taylor factor.